# Relationship history for MSHA mine 4103102

Current hierarchy: **Mesecke Ernest-Charles L Stanford → Emco Materials & Equipment Inc → Stanford Quarry And Plant**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Emco Materials & Equipment Inc → Stanford Quarry And Plant; 1981-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mesecke Ernest-Charles L Stanford Et Al → Stanford Quarry And Plant; 1981-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mesecke Ernest-Charles L Stanford Et Al → Emco Materials & Equipment Inc; 1981-10-01 to current/open; source msha-controller-operator-history